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is the heater box front plate removable?

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neversinksmith Bradford Smith
Rock Hill, NY, USA   USA
1977 MG MGB
1977 MG MGB ~ For Sale ! ~
1977 MG MGB
doing some research on improving the heat on the 77b and came across this photo.
I noticed I have the same clips on my heater box and wondered if I could pull the front plate off to examine and clean out the box. just wanted to ask if it does in fact come off before I attempt and potentially mess something up.
it sounds like removing and installing the heater box is no fun.
thanks guys

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warekl Avatar
warekl Silver Member Keith Ware
White Bear Lake Mn, USA   USA
1973 MG MGB GT
1979 MG MGB
Don't think so. The front cover extends down and inch or so and you couldn't pull it up straight, it would jam and it won't tilt toward the front of the car either. Once you remove the assembly, you can cut the front cover across the lower front so that you can remove it in the future, not an uncommon modification.....



USMC ... Semper Fi
79 RB Lowered, HS4s by Dave Braun & "Schlemmerized" 25D Dizzy, 9.5:1 CR, Mild Performance Cam, 18V with OD Tranny.

73 GT in Black Tulip

DrewM Avatar
DrewM Drew Maddock
74 MGB roadster, Southern California, USA   USA
I believe you can unscrew and withdraw the fan and motor. Three screws. That's something at least.

It may look easy to remove the entire heater box. But it extends down aways, so removing and reinstalling the heater box is often considered the most difficult job on an MGB along with with the windscreen. Not easy, in other words.

I don't think you can remove that front cover but apparently you can get it open a little bit. If you discover a way to remove it, be sure to let us know! There are people who'd be interested in that miracle. thumbs up



Drew Maddock, So. Calif. USofA

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Mr Creosote Avatar
Mr Creosote Dennis C
Visalia, CA, USA   USA
1967 MG MGB
I just installed my heater box today. I have to agree, Its, ummm, not the easiest task to do. It extends below the deck a little and that lip runs all the way around. The box has to come out as a unit. I did my tranny a couple of months ago and I was thinking this evening that it was an easier job almost. Attached to the bottom of the box is a diverter which makes it extend down even further. Then the cable from the diverter fishes up to the control knob. The screw under the fan motor is fun. But don't let us discourage you, its doable. Just be patient. I think in that picture someone may have thought it would come off but found out different.


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DrewM Avatar
DrewM Drew Maddock
74 MGB roadster, Southern California, USA   USA
I was just thinking that the heater box "hole" is like the dark side of the moon. Rumored to be there, but hardly ever seen by human eyes.



Drew Maddock, So. Calif. USofA

allanreeling ALLAN R
RANDLAY, TELFORD, Shropshire, UK   GBR
If you do remove the heater box a possibility is to make a cut line at bulkhead level so that, should you wish, the front can be removed.
You will probably find it has been described, on this site, before. Do a search.



soonerv8

Donthuis Avatar
Donthuis Don van Riet
Rijswijk, ZH, Netherlands   NLD
If examination and cleaning is all you want, why not take out the motor with its fan attached and look inside with a mirror and blow air in with a compressor (with both up or down flap positions)?
My guess is any dust assembled inside will be pushed out by force. Maybe these two flexible hoses under the dash to the windscreen vents will get loose, so check and if needed reposition them back...

I once took the heater out and put it back in to solve a sticking flap + cable all on my own in just one afternoon, little did I know to most of us this is a PITA job.
Maybe by now it is also to me: aging foam on the bottom junction and aging me are the factors involved devil smiley

PS A strong candidate for PITA jobs is renewing the rear seal on the drive flange sitting at the end of a 4sync/OD gearbox when still in situ (dropping the gearbox crossmember only helps partially)
Another one is renewing the OD lockout switch on such a gearbox in situ (dropping the crossmember is then an absolute must). BTW I never had a garage lift at my disposal at home.....

In reply to # 3889338 by neversinksmith doing some research on improving the heat on the 77b and came across this photo.
I noticed I have the same clips on my heater box and wondered if I could pull the front plate off to examine and clean out the box. just wanted to ask if it does in fact come off before I attempt and potentially mess something up.
it sounds like removing and installing the heater box is no fun.
thanks guys

tvrgeek Avatar
tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
1965 MG MGB
A little easier job if you make the port for the cable a bit bigger. We can complain how hard it is to get to the core, but let my give you a hint. Look at a new car! Did the core on my Sonoma. The entire dash has to come out and there are bolts behind the engine that to access you would have to pull it out too. To put it back in, you have to drill access holes in the engine bay cover. Two days. Without a few Y-Tubes, it would have been a week. At least it is big enough to roast you.

If I build another MG, I am cutting the entire thing out and building a larger heat/AC system. Compared to a TVR, gobs of room behind the dash.



Cogito ergo sum periculoso

Sinewave Avatar
Sinewave T. Keith Vezina
Kenner, LA, USA   USA
IIRC, the fan is slightly larger than the hole so you can not remove it by just taking out the screws.

A common modification is to remove the lip on the bottom of the cover so that next time you can pull it without removing the entire heater box.



T. Keith Vezina
British Motoring Club New Orleans
1976 MGB, 1976 MGB Trailer & 1967 MGB MK. I

psksks76 Avatar
psksks76 Gold Member Pete Shannon
burlington, NC, USA   USA
The fan itself is about an inch smaller diameter than the heater box opening on all model years, so the motor & fan can be removed as one to gain access to the majority of the inside of the box.
Also, if the wire mesh piece that blocks access between the incoming fresh air vent ducting at the firewall has disappeared,(as many of them have), you can also reach your hand or a vacuum hose into that compartment as well for cleaning.
The only accessibility exception would be the 77-80 years which have the fan speed resistor mounted internally as well as the wiring for it, which prevents the motor & fan from being pulled out without unsoldering the connections at the resistor.



Edited 1 time(s). Last edit at 2019-02-11 11:54 AM by psksks76.

Mr Creosote Avatar
Mr Creosote Dennis C
Visalia, CA, USA   USA
1967 MG MGB
The motor/fan does come out very easy, (I had mine out yesterday). But its a single speed. I was thinking what makes this such a dreaded job after just doing it. It seemed to mostly come down to 3 things for me. The screw that's under the fan area is a challenge. The cable for the flap is another. I installed it to the flap before I put it in and fished it through as I seated the box to the bulkhead. Then hooked it up to the controller. Then getting the screw holes lined up after setting the box in place. With new gaskets you have to push the box tight into the bulkhead to get them started. I imagine having a helper would of helped. There is a 4th also for me, being in my 60's. I don't see as good as I used to. My hips, knee and shoulders hurt. I can't contort my body to get up under the dash as easy. I was pretty sore last night. Advil is my friend. Today I'm going to get some fresh heater hose and should have it back on the road this afternoon.

flash75 Clifton Gordon
Summerfield, FL, USA   USA
I have removed the front cover on a 74 heater box to change the heater core. After removing
the fasteners I carefully bent the cover forward and pulled it out. After finishing I bent the
cover back to the original position. It wasn't perfect and the place where it was bent was
noticeable it you looked carefully. I didn't have a show car so no harm was done. I don't recall
how long it required to finish the job, I think a little over 2hours. I don't know if other year cars
could be done the same.

Clifton

Cornfgl Avatar
Cornfgl Graham Cornford
Bellville, TX, USA   USA
1974 MG MGB GT V8 "Goose Poop"
When you do remove the heater box, it is a no brainier, so make the front cover into 2 pieces, which I did some 20 years ago, not even thinking that I would be in there again.

I have been in there twice since, and I can have my front cover off the heater in as little as 10 minutes, and that includes removing the carbs and pair of trousers on my V8 to get access to the heater.

If you intend to keep the car for a long time, you will save yourself the frustration and time later, so do it when you have the heater out the first time. No one can see if the box has been tampered with once back together.

earlspoint Avatar
earlspoint Richard Earls
NA, WA, USA   USA
No you can not remove the front cover without removing the complete heater unit.
As stated you can remove the three screws on the front cover that mounts the fan motor in place. Then pull the motor/fan/mount place away from the heater unit. Then as noted you can vacuum out the unit. There are directions in the tech Library and other sites explaining the complete
R&R of the unit. I have restored 3, IT's not the hellish job people make it out to be. Just take your time. hardest part is breaking free the unit from the base due to the old seal sticking. Second with your late model the control cable runs thru the unit.



Vietnam combat Vet - The fight against socialism 1945 - .
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